As far as i've noticed it hasn't been in effect. My primary reason for posting that in the first place is because i rarely, if ever, hit a sleeping monster and the logic of the situation confounds me..

*Approach sleeping Dragon* "You attack the dragon! Your attack misses* o.O

I think attacks shouldn't miss sleeping monsters. It sucks to sneak up on a sleeping leprechaun, attack it, only to miraculously miss the immobile enemy and lose your gold (along with a few limbs in the case of gryphons...). Another thing could be a possible damage bonus on sleeping monsters, maybe ...